纳米纤维
发光
材料科学
静电纺丝
煅烧
顺磁性
化学工程
纳米技术
双功能
扫描电子显微镜
荧光粉
电子顺磁共振
分析化学(期刊)
光电子学
复合材料
核磁共振
化学
有机化学
聚合物
工程类
物理
催化作用
量子力学
作者
Dan Li,Qianli Ma,Xue Xi,Xiangting Dong,Wensheng Yu,Jinxian Wang,Guixia Liu
标识
DOI:10.1016/j.cej.2016.10.027
摘要
Luminescent-magnetic bifunctional NaGdF4:Dy3+,Eu3+ nanofibers have been successfully fabricated via the combination of electrospinning followed by calcination with fluorination technique for the first time. The structure, morphologies, luminescence, and magnetic properties of the synthesized nanofibers have been characterized by a variety of techniques. X-ray diffraction (XRD) analysis shows that as-prepared NaGdF4:Dy3+,Eu3+ nanofibers are pure hexagonal structure. Scanning electron microscope (SEM) observations indicate that directly electrospinning-made PVP/[NaNO3 + Gd(NO3)3 + Dy(NO3)3 + Eu(NO3)3] composite nanofibers have smooth surfaces, good dispersion and uniform size, and the surfaces of NaGdF4:Dy3+,Eu3+ nanofibers become rough after calcination and fluorination process. The diameters of composite nanofibers and NaGdF4:Dy3+,Eu3+ nanofibers are respectively 400.19 ± 48.06 nm and 245.90 ± 52.10 nm. NaGdF4:Dy3+,Eu3+ nanofibers exhibit predominant visible emission under 274 nm ultraviolet light excitation and the trend of their color tones changes from blue, cold white, warm white to red by adjusting the molar concentration of Eu3+. In addition, all of the samples exhibit paramagnetic features and the magnetic properties of NaGdF4:Dy3+,Eu3+ nanofibers are tunable by changing the species and doping concentration of RE3+ ions. More importantly, the tunable multicolor luminescence and paramagnetic properties are simultaneously realized in single-phase NaGdF4:Dy3+,Eu3+ nanofibers, which ideally suit to apply in many fields such as solid-state lasers, lighting and displays, magnetic resonance imaging. This design conception and construction strategy developed in this work may provide some new guidance for the synthesis of other rare earth fluorides nanostructures with various morphologies.
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